in reply to mac to IP address?

Hardly twisted at all. This is exactly what Reverse Address Resolution Protocol (RARP) is for. Though in the case of trying to automatically set a machine's IP, you're better off with DHCP. I suspect you have some other twisted purpose, though.

----
I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

: () { :|:& };:

Note: All code is untested, unless otherwise stated

In Section Seekers of Perl Wisdom